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b8 D�sign Manual for Segmenta]Retaining Walls <br /> � <br /> i <br /> Section 4.3 � <br /> l0�CI1vIMUM FACTORS OF SAFETY FUR ST "Y ANALYSES '; <br /> Seiection of appropriate fa,cto�ts Qf safety should be based on the certainty with which design <br /> a <br /> parazneters and the consequences�f faiIure are known. Table 411ists the re�ommendeci minimum ` <br /> safety faciois far gravity SRWs. cluded in these recommended minsmums aze ty�a levels af ; <br /> uncertainry izi wall geometry and amposed loada,ngs. � <br /> `s <br /> TABLE 4-1 ` <br /> Recommended Minimum Factors of Safety for Design <br /> of C�onventtona!SRWs <br /> �'S � <br /> Failure Modes ` <br /> � <br /> Base Sliding FS,, 1.5 � <br /> Overturning FS� � 1.5 <br /> Bearing Capacity FS& 2.� ' <br /> Internal Shear Capacity FS� 1.5 � <br /> Global Stabiiity FS�, 1.3 - 1.5 <br /> Section 4.4 . <br /> SEGMFNTAL UI�IIT PRQPERI`IES <br /> Dimensions and rnechanical properties of segenental units must be established priar to design. <br /> es€pazameters are: <br /> H� = SRW unit heig�t(ft} <br /> H�= SRW unft ca�(coping)�eight{ft} <br /> Nj� = SRW unit w�dth{ft) <br /> y„ = weight of segmenta] unit per unit volume as plaa�d(includes stone�Il if applicable) <br /> PG� <br /> G� = distance to center of g�°av�ty c�9F horizontat SRW Unit, including drairnage fi11, <br /> meas��ned from the front face of the urut(ft) <br /> _____-— <br /> ----- ___-- —.....................___..... <br /> �t--��r�}-bat#e� �fPTen���ac-Tc per course{deg) <br /> � = i�te�'ace friction coe�cient for base segmental unit sliding on bearing st�xls <br /> a�,,, = apparent minimum shear capacity between segmental units(lblft) <br /> a.,, apparent angle of friction Uetween se ental units(deg} <br /> dr, = setback per course Hp (in.} <br />